Mojo JS: Attempt to simplify bindTo* related code.

mojo/public/js/connection.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 define("mojo/public/js/connection", [
   "mojo/public/js/bindings",
   "mojo/public/js/connector",
   "mojo/public/js/core",
   "mojo/public/js/router",
 ], function(bindings, connector, core, router) {
@@ skipping 130 matching lines @@
     if (!core.isHandle(handle))
       throw new Error("Not a handle " + handle);
 
     var stub = new localInterface.stubClass;
     var router = new Router(handle);
     var connection = new BaseConnection(stub, undefined, router);
     StubBindings(stub).connection = connection;
     return stub;
   }
 
+  /**
+   * Creates a messape pipe and links one end of the pipe to the given object.
+   * @param {!Object} obj The object to create a handle for. Must be a subclass
+   *     of an auto-generated stub class.
+   * @return {!MojoHandle} The other (not yet connected) end of the message
+   *     pipe.
+   */
+  function bindStubDerivedImpl(obj) {
+    var pipe = core.createMessagePipe();
+    var router = new Router(pipe.handle0);
+    var connection = new BaseConnection(obj, undefined, router);
+    obj.connection = connection;
+    return pipe.handle1;
+  }
+
   var exports = {};
   exports.Connection = Connection;
   exports.TestConnection = TestConnection;
 
   exports.bindProxy = bindProxy;
   exports.bindImpl = bindImpl;
   exports.bindHandleToProxy = bindHandleToProxy;
   exports.bindHandleToStub = bindHandleToStub;
+  exports.bindStubDerivedImpl = bindStubDerivedImpl;
   return exports;
 });